File lost from NetBSD merge in january!

1 files changed, 88 insertions, 0 deletions

diff --git a/sys/arch/m68k/m68k/sigreturn.s b/sys/arch/m68k/m68k/sigreturn.s
new file mode 100644
index 00000000000..63017e36048
--- /dev/null
+++ b/sys/arch/m68k/m68k/sigreturn.s
@@ -0,0 +1,88 @@
+/*	$OpenBSD: sigreturn.s,v 1.1 1996/05/03 08:44:33 niklas Exp $	*/
+/*	$NetBSD: sigreturn.s,v 1.1 1996/01/31 02:22:15 thorpej Exp $	*/
+
+/*
+ * Copyright (c) 1988 University of Utah.
+ * Copyright (c) 1980, 1990, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * the Systems Programming Group of the University of Utah Computer
+ * Science Department.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * from: Utah $Hdr: locore.s 1.66 92/12/22$
+ *
+ *	@(#)locore.s	8.6 (Berkeley) 5/27/94
+ */
+
+/*
+ * NOTICE: This is not a standalone file.  To use it, #include it in
+ * your port's locore.s, like so:
+ *
+ *	#include <m68k/m68k/sigreturn.s>
+ */
+
+/*
+ * The sigreturn() syscall comes here.  It requires special handling
+ * because we must open a hole in the stack to fill in the (possibly much
+ * larger) original stack frame.
+ */
+sigreturn:
+	lea	sp@(-84),sp		| leave enough space for largest frame
+	movl	sp@(84),sp@		| move up current 8 byte frame
+	movl	sp@(88),sp@(4)
+	movl	#84,sp@-		| default: adjust by 84 bytes
+	moveml	#0xFFFF,sp@-		| save user registers
+	movl	usp,a0			| save the user SP
+	movl	a0,sp@(FR_SP)		|   in the savearea
+	movl	#SYS_sigreturn,sp@-	| push syscall number
+	jbsr	_syscall		| handle it
+	addql	#4,sp			| pop syscall#
+	movl	sp@(FR_SP),a0		| grab and restore
+	movl	a0,usp			|   user SP
+	lea	sp@(FR_HW),a1		| pointer to HW frame
+	movw	sp@(FR_ADJ),d0		| do we need to adjust the stack?
+	jeq	Lsigr1			| no, just continue
+	moveq	#92,d1			| total size
+	subw	d0,d1			|  - hole size = frame size
+	lea	a1@(92),a0		| destination
+	addw	d1,a1			| source
+	lsrw	#1,d1			| convert to word count
+	subqw	#1,d1			| minus 1 for dbf
+Lsigrlp:
+	movw	a1@-,a0@-		| copy a word
+	dbf	d1,Lsigrlp		| continue
+	movl	a0,a1			| new HW frame base
+Lsigr1:
+	movl	a1,sp@(FR_SP)		| new SP value
+	moveml	sp@+,#0x7FFF		| restore user registers
+	movl	sp@,sp			| and our SP
+	jra	rei			| all done